LED用荧光玻璃的制备及性能研究

Preparation and Performance of Ce:YAG Phosphor-in-glass

以行星球磨得到的SiO2粉体和商用Ce:YAG荧光粉为原料,采用放电等离子体烧结技术(简称SPS)成功制备块体荧光玻璃。利用XRD、SEM、紫外/可见光分光光度计和荧光光谱仪等研究了Ce:YAG荧光玻璃的物相、显微结构、吸收和发光性能等。研究结果表明:SPS烧结制备的块体荧光玻璃样品主体是非晶相,同时荧光粉颗粒在玻璃基质中均匀分布,颗粒大小也未发生变化,这表明荧光粉晶体在SPS烧结过程中没有发生化学分解反应,在玻璃基体中得到很好地保存。该荧光玻璃吸收峰在460 nm左右,发射波长在530 nm左右。通过对不同含量荧光粉的荧光玻璃进行发光性能表征,发现荧光粉含量为3wt%的荧光玻璃性能最佳,以此封装的白光LED样品在800 m A电流驱动下,获得白光输出,色坐标为(0.33,0.38)。

One-step spark plasma sintering （SPS） process was introduced to fabricate Ce：YAG phosphor-in-silica-glass （PiSG）, of which the composite powder of glass powder/commercial Ce：YAG phosphor was directly obtained by ball mill grinding. The phase, microstructures, absorption spectrum and photolumineseence properties of PiSG samples were in- vestigated by XRD, SEM, UV-Vis spectrophotometer, fluorescence spectrophotometer, etc. The results showed that the as-sintered PiSG sample had amorphous phase and the Ce：YAG phosphor particles was uniformly distributed in glass ma- trix with no size change, indicating that Ce：YAG phosphor particles were well preserved in silica glass matrix without any decomposition reaction. There was a strong absorption peak around 460 nm and a broad emission band peaked at 530 nm of PiSG sample. The properties of PiSG samples were studied by adjusting the phosphor concentration, demonstrating that the photoluminescence intensity reached the highest when Ce：YAG phosphor concentration was 3wt%. Besides, the optimized 3wt% PiSG based LED modules fell into white light range（0.33, 0.38） under 800 mA current drive.